Yeah , but overfilling is common practice in some parts. Even LPG tanks used in cars. I don't know how or why the loading installation allows it, but it happens, and it leads to some quite explosive results sometimes. Not to mention the old 'cooking gas tank hooked to the LPG port thingIt appears to be CO2, which is a rechargeable cylinder, at least here in the U.S. It appears he accidentally dropped it and damaged the valve. CO2 is a liquid under pressure, lotsa mass inside.